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Preparation method for lignosulfonate

A technology of lignosulfonate and lignin, which is applied in the field of pulping waste liquid recycling, can solve the problems of complex process, long production cycle, low production efficiency, etc., and achieve the effect of simple process flow, simplified process and saving raw materials

Active Publication Date: 2011-08-03
延边石岘双鹿实业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires three stages of filtration, the process is complex, the production cycle is long, the production efficiency is low, and a large amount of waste water will be generated, causing secondary pollution

Method used

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  • Preparation method for lignosulfonate

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preparation example Construction

[0030] The invention provides a kind of preparation method of lignosulfonate, comprises the following steps:

[0031] a) Mixing waste pulping liquor by kraft method and waste pulping liquor by sulfite method to obtain mixed waste liquor, the pH value of the mixed waste liquor is 12-13, and the waste pulping liquor by kraft method includes wood and sodium hydroxide, and the sulfite process pulping waste liquor includes calcium lignosulfonate and reducing sugar;

[0032] b) After raising the temperature of the mixed waste liquid and keeping it warm, the first solution is obtained;

[0033] c) After adjusting the pH value of the first solution to 10.5-11.5, adding an aldehyde compound therein to obtain lignosulfonate after reaction.

[0034] The present invention uses kraft pulping waste liquor and sulfite pulping waste liquor as raw materials to prepare lignosulfonate, wherein, kraft pulping waste liquor refers to the waste liquor produced after kraft pulping , whose main comp...

Embodiment 1

[0055] The kraft pulping waste liquid is the waste liquid produced by pulping with rice straw as raw material and sodium hydroxide and sodium sulfide as the cooking liquid. The kraft pulping waste liquid is concentrated, and in the obtained first concentrate The mass content of lignin is 30%;

[0056] Sulphite pulping waste liquid is the waste liquid produced by pulping with rice straw as raw material and calcium bisulfite as cooking liquid. The sulphite pulping waste liquid is concentrated, and the obtained second concentrated liquid is The mass content of calcium lignosulfonate is 60%;

[0057] Mix the first concentrated liquid and the second concentrated liquid so that the pH value of the obtained mixed waste liquid is 12.5; under the condition of stirring, raise the temperature of the mixed waste liquid to 95° C., stir and react for 2 hours, and obtain the first solution, the reducing sugar in the first solution is 4.5%;

[0058] Passing carbon dioxide-rich flue gas into...

Embodiment 2

[0065] Kraft pulping waste liquid is the waste liquid produced by pulping with bamboo as raw material and sodium hydroxide and sodium sulfide as the cooking liquid. The kraft pulping waste liquid is concentrated, and in the obtained first concentrate The mass content of lignin is 35%;

[0066] Sulphite pulping waste liquid is the waste liquid produced by pulping with bamboo as raw material and calcium bisulfite as cooking liquid. The sulphite pulping waste liquid is concentrated, and in the obtained second concentrated liquid The mass content of calcium lignosulfonate is 65%;

[0067] Mix the first concentrated liquid and the second concentrated liquid so that the pH value of the obtained mixed waste liquid is 12.3; under the condition of stirring, the temperature of the mixed waste liquid is raised to 90° C., and stirred for 2 hours to obtain the first solution, the reducing sugar in the first solution is 1%;

[0068] Introduce flue gas rich in carbon dioxide into the first...

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Abstract

The invention provides a preparation method for lignosulfonate, which comprises the following steps: (a) mixing a sulfate process pulping waste liquid and a sulphite process pulping waste liquid so as to obtain a mixed waste liquid, wherein the pH value of the mixed waste liquid is 12 to 13, the sulfate process pulping waste liquid comprises lignin and sodium hydroxide and the sulphite process pulping waste liquid comprises calcium lignosulphonate and reducing sugar; (b) heating up the mixed waste liquid and keeping the mixed liquid warm so as to obtain a first solution; and (c) adjusting the pH value of the first solution to be in the range of 10.5 to 11.5 and adding aldehydes compounds to the first solution so as to obtain calcium lignosulphonate after reaction. In the preparation method, as the two waste liquids are mixed and then are processed together, the two waste liquids are neutralized by using different alkalinity and acidity of the two waste liquids, and chemical agents such as alkali or acid and the like do not need to be additionally added so as to save raw materials and simplify the process.

Description

technical field [0001] The invention belongs to the technical field of pulping waste liquid recycling and utilization, and in particular relates to a preparation method of lignosulfonate. Background technique [0002] Lignin, also known as lignin, is a complex phenolic polymer formed from p-coumaryl alcohol, coniferyl alcohol, 5-hydroxy coniferyl alcohol and sinapyl alcohol, and is also a by-product of kraft paper pulping. There are aromatic groups, alcoholic hydroxyl groups, phenolic hydroxyl groups, carbonyl groups, methyl groups, carboxyl groups and side chain structures in the molecular structure of lignin, so it can be oxidized, phthalated, sulfonated, alkylated, halogenated, nitrated, polycondensed, etc. Chemical reaction, among which, the sulfonation of lignin to obtain lignosulfonate is the basis and premise of lignin application. [0003] Lignosulfonate, also known as sulfonated lignin, can be obtained by sulfonating lignin, and it is also a by-product of paper pul...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 郑艳民朱德仁徐龙杰
Owner 延边石岘双鹿实业有限责任公司
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